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CVE-2025-66614 is an improper input validation vulnerability in Apache Tomcat affecting versions 11.0.0-M1 through 11.0.14, 10.1.0-M1 through 10.1.49, and 9.0.0-M1 through 9.0.112. Tomcat failed to verify that the TLS Server Name Indication (SNI) hostname matched the HTTP Host header. In multi-virtual-host TLS deployments where one virtual host does not require client certificates and another does, an attacker can submit different hostnames in SNI and the HTTP Host header to bypass Connector-enforced client certificate authentication. Tomcat 8.5.0 through 8.5.100 is also affected; older end-of-life versions are not affected.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
28 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An Apache Tomcat client-certificate verification bypass caused by virtual-host mapping. The plugin identifies this CVE as a CVSS score source and reports exploits are available.
A critical network-accessible vulnerability referenced by the AlmaLinux 9.6 TuxCare local security-check plugin. The supplied metadata gives it a CVSS v2 vector of AV:N/AC:L/Au:N/C:C/I:C/A:N, indicating unauthenticated, low-complexity remote exploitation with high confidentiality and integrity impact. No known exploit is available according to the plugin.
An Apache Tomcat vulnerability included in SAP's bundled advisory for SAP Commerce Cloud embedded Tomcat server weaknesses.
An Apache Tomcat improper-input-validation vulnerability resulting from an incomplete fix for CVE-2025-66614. The notice identifies affected Tomcat version ranges and provides fixed releases.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.